https://news.ycombinator.com/item?id=22106801
The thing is that this delayed gratification is what allowed modern society to appear in the first place. Without delayed gratification you can't have farming or housing. Both of which are vitally important for human survival in most places in the world.
Humans, and probably all life, have a high time preference. We even have sayings about this in the form of "a bird in hand is better than two in the bush." My guess is that this has to do with the future being difficult to predict. It's essentially a balance between how many resources you should use right now vs how much you should invest into the future.
This could also be why some non Aryans undertake things such as partying/alcoholism during their college years: they feel that youth is meant for "enjoyment" and that not doing so means one is "wasting their youth". This could also be why they reproduce early.
After thinking it through, I believe the above behavior is a product of delayed gratification, namely the destruction of original nobility by compulsory education. When they were children, those individuals might have been interested in non adult activities. But because they were not allowed to do those things then, when they were finally given "freedom" in adulthood, their original nobility was destroyed so they became interested in worldly things.